'''
Recompress all jpg images in the current directory.
'''
import argparse
import io
import os
import PIL.Image
import PIL.ImageFile
import sys

from voussoirkit import bytestring
from voussoirkit import imagetools
from voussoirkit import pipeable
from voussoirkit import spinal

PIL.ImageFile.LOAD_TRUNCATED_IMAGES = True

def rejpg_argparse(args):
    patterns = pipeable.input_many(args.patterns, skip_blank=True, strip=True)
    files = spinal.walk(recurse=args.recurse, glob_filenames=patterns)

    files = [f.absolute_path for f in files]

    bytes_saved = 0
    remaining_size = 0
    for filename in files:
        print(filename)
        bytesio = io.BytesIO()
        image = PIL.Image.open(filename)

        (image, exif) = imagetools.rotate_by_exif(image)

        image.save(bytesio, format='jpeg', exif=exif, quality=args.quality)

        bytesio.seek(0)
        new_bytes = bytesio.read()
        old_size = os.path.getsize(filename)
        new_size = len(new_bytes)
        remaining_size += new_size
        if new_size < old_size:
            bytes_saved += (old_size - new_size)
            f = open(filename, 'wb')
            f.write(new_bytes)
            f.close()

    print('Saved', bytestring.bytestring(bytes_saved))
    print('Remaining are', bytestring.bytestring(remaining_size))

def main(argv):
    parser = argparse.ArgumentParser(description=__doc__)

    parser.add_argument('patterns', nargs='+', default={'*.jpg', '*.jpeg'})
    parser.add_argument('--quality', type=int, default=80)
    parser.add_argument('--recurse', action='store_true')
    parser.set_defaults(func=rejpg_argparse)

    args = parser.parse_args(argv)
    return args.func(args)

if __name__ == '__main__':
    raise SystemExit(main(sys.argv[1:]))